Fig. 11.

Inhibition in rabbit DSGCs saturates within 1 contrast step. A and B: amplitudes of the light-evoked inhibitory and excitatory Off (A) and On (B) currents in rabbit DSGCs (n = 20) normalized to the maximal amplitudes at the highest contrast of 90%. Dashed lines represent 0 baseline. DSGCs were stimulated with dark or light bars moving in the null direction at a velocity of 200 μm/s. Note that the inhibition jumped from 0 to a maximum within a single step of the contrast, whereas the excitation increased with contrast gradually.